Naturally occurring Strontium consists of four isotopes, Sr-84, Sr-86, Sr-87 and Sr-88. Below is the data concerning Strontium: Sr-84 Sr-86 Sr-87 Sr-88
0.56% 9.86% 7.00% 82.58%
What is the average atomic mass of Strontium? Show ALL work, for full credit.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

Answer asap need by wednesday morning calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 best answer will be brainliest